Board of Governors of the Federal Reserve System (U.S.), 1935-. "Major Market Groupings," in Board of Governors of the Federal Reserve System (U.S.), 1935-. "November 16, 1971," G.12.3 Industrial Production (1971-11-16) : 8-8. https://fraser.stlouisfed.org/title/55/item/59587/toc/468242 , accessed on May 2, 2024.